An Alabama county is warning parents about a game aimed at teens that can turn deadly. The Blue Whale Challenge, or Blue Whale Game, is a 50-day challenge that encourages students to self-harm, ending in suicide.

A Blue Whale Challenge app was reportedly available for students to download, but has been removed from Apple's iOS store and the Google Play store as of press time.

Participants can even tag one another on social media networks like Snapchat and invite others to play.

"It is my understanding that this very dangerous game may have possibly already been introduced on two of our high school campuses," Baldwin County Public Schools wrote in a Facebook post on Tuesday. "As shared with me by the social worker, this game or challenge began in Russia, and it is basically a challenge to harm yourself for fifty days, with the intention being to ultimately kill yourself on the fiftieth day."

The challenge has also popped up in France and Brazil in recent months, and law authorities warn parents to remain vigilant.